/*H*****************************************************************************
*
* $Archive::                                                                   $
* $Revision::                                                                  $
* $Date::                                                                      $
* $Author::                                                                    $
*
* DESCRIPTION: contains the timing functions for the TMS320C5410 DSP.
*
* GLOBALS
*
* PUBLIC FUNCTIONS:
*                              
* PRIVATE FUNCTIONS:
*
* USAGE/LIMITATIONS:
*
* NOTES:
*   
* AUTHOR: Patrick Cresap, 2000
*
*H***************************************************************************/
#define timer5410_c

/*---- compilation control switches ----------------------------------------*/

/*****************************************************************************
* INCLUDE FILES
*****************************************************************************/
/*---- system and platform files -------------------------------------------*/

/*---- program files -------------------------------------------------------*/
#include "timer5410.h"
/*****************************************************************************
* EXTERNAL REFERENCE    
*****************************************************************************/
/*---- data declarations ---------------------------------------------------*/
extern CLOCK_STRUCT clock;
/*---- function prototypes -------------------------------------------------*/

/*****************************************************************************
* PUBLIC DECLARATIONS 
*****************************************************************************/

/*-- Interrupt macros-------------------------------------------------*/
#define GLOBAL_INT_ENABLE    asm( " rsbx intm ") /* enables interrupts*/
#define GLOBAL_INT_DISABLE   asm( " ssbx intm ") /* disable interrupts*/

/*****************************************************************************
* PRIVATE DECLARATIONS  
*****************************************************************************/
/*---- context -------------------------------------------------------------*/

/*---- data declarations ---------------------------------------------------*/


/*---- function prototypes -------------------------------------------------*/

/*---- macros --------------------------------------------------------------*/

/*****************************************************************************
* PUBLIC FUNCTION DEFINITIONS
*****************************************************************************/

/*F***************************************************************************
* NAME: void C5XX_TimerInit( int TintPeriod  )
*
* DESCRIPTION:  
*   Initializes the C5XX timer.
*
* NOTES:  You must stop the timer before changing period or values and then 
* 	restart it.
*F***************************************************************************/

void C5XX_TimerInit( int TintPeriod  )
{                              
    /*-- Stop the timer, set prd and TCR, start the timer -----------------*/    
    *TCR = TSS;                        
    *PRD = TintPeriod;    			   
    *TCR =  TDDR0 | TDDR3 | TCR_SOFT;  
    								   
    *TCR |= TRB;                       
} 

/*F***************************************************************************
* NAME:  void time ( void )
*
* DESCRIPTION:  
*   A basic timing function that counts milliseconds, seconds, minutes, and
*   hours.
* NOTES:  Only counts to 24 hours, 59 mins, 59 secs, then resets.   
*
*F***************************************************************************/
         
void time ( void )
{    
	clock.millisecond++;
	if (clock.millisecond == 1000)
	{
		clock.millisecond = 0;
		clock.second++;
	}
	if (clock.second == 60)
	{
		clock.second = 0;
	 	clock.minute++;  
	}
	if (clock.minute == 60)
	{ 
		clock.minute = 0;
		clock.hour++;  
	}
	if (clock.hour == 24)
	{
		clock.hour = 0;
	}
}	 	                       


/*F***************************************************************************
* NAME: void set_time(void)
*
* DESCRIPTION:  
*	sets the time by incrementing by the number of timer interrupts there are
*
* NOTES: 
*	writes outside ofinterrupt
*F***************************************************************************/

void set_time(void)
{              
	
	while (clock.tick)
	{ 
		time(); 
	    GLOBAL_INT_DISABLE;
    	clock.tick--;
	    GLOBAL_INT_ENABLE;             		
	}                                  
}